Inductor-magneto.



R. C. LNPHIBR.

INDUCTOR MAGNETO. APPLICATION FILED OCT. 9, 1909. Y 1,027,550, Patented May 28, 1912.

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INDUCTOR MAGNETO.

AYPLIGATIOH funn 00T. 9, 1909.

Patented May 28, 1912.

2 SHEETS-SHEET 2.

y To all 'l0/"tom t may concern f practically close the air gap.

"UNITED sTATns PATENT oFFIcE.

ROBERT C.LANP-IIER, OF SPRINGFIELD, ILLINOIS, ASSIGNOR T SANGAMO ELECTRIC I COMPANY, 0l? SPRINGFIELD, ILLINOIS, A CORPORATION OF ILLINOIS.

animeren-meenam.

Be it known that I, Romani* C. LANPHiER, a citizenof the Unitcdytates, residing at Springfield, in the county of Sangamon, State of Illinois, have invented certain new and useful Improvements in Inductor-Magnetos, of which the folle-Wing is a specifi cat-ion, reference being had to the accompanying drawings. a y

My invention relates vto inductor magnetos of the` type which have no moving wires or contacts, and its' object is to prolvide a new and improved arrangement and operation by which the magnetic lines of force` through the stationary core' about which the coil is Wound may be cut as suddenly as possible, producing a correspondingly sudden increase in potential in the coil and maximum sparking eiticiency.

To this end, it is one of the objects of my .invention to arrange the construction in such a Way that the soit-iron parts of the path which the magnetic lines ot force are caused to take, including-the core upon which the primary and secondary coils of my improved high-tension l,machine are mounted, can be made in laminated form with the separate plates of' such soft-iron parts all extending in the direction which the lines of force Would naturally travel, thus avoiding eddy currents almost entirely and securing maximum eihciency. I accom- -plish this object by separating the station ary core about which the coils are Wound by a Wideair gap from the magnets and by r0- tatingvbetweenthe pole pieces of the magnet andthe ends of the core labout which the coils arewound laminated'soft-iron parts of a size to readily pass between themand to My arrangement of devices attains the further object of minimizing the demagnetizing effect upon the permanent magnets which I use, this being accomplished by reasony of the fact that the magnetic lines of force have at all times a practically contin nous soft-iron circuit from pole to pole, the lines of force passing either through the laminated soft-iron rotating parts directly from pole to pole or from pole to pole through said 'rotating parts and through the laminated soft-iron stationary core.

Another object of my invention is to provide an additional soft-iron path for the specification of Letters Patent.

appiication 'led October 9, 1909.

Patented May 28,1912. serial No. 521,947.A

to pole which shall be effective for a very magnetic lines of force ldirectly from pole short time just when the soft-iron rotating parts begin their passage alongside of the pole pieces. This expedient prevents the heavy end thrust to a very reat extent which would otherwise be exerte upon the axle of the rot-atingl parts at the commencement of the passage of such parts alongside of the pole pieces and thus prevents any appre` ciable tendency of the rotating parts to impinge upon the pole pieces.

AIt is the further object, of my' invention to improve in sundry details of construction Inagnetos of the type named.

I` accomplish these objects by the me'ans illustrated in the drawings and hereinafter specifically described.

That which I believe to be new will be set forth in the claims.

In the drawings z--Figurev 1 is a side elevation, partly in section, of my improved Fig. 2 is a cross section on line 2 2 of Fig. 1. Fig. 3 `is a cross section on lline 3--3 of Fig.4 1, with the 4inclosing casing omitted. Fig. 4 is a perspective View, of one of the pole pieces of my improved magnetol Fig. 5 is an'enlarged detail, being a perspective view of one of the 'arc'- shaped end pieces of the stationary core about which the coils are wound.

Referring to the drawings :-10 indicates a base, upon which are secured in any suit able manner so as to coperate to produce a magnetic field between the pole pieces hereinafter described'the magnets 11, 12, 13 and 14. At theincnds, the magnets have secured' to them soft-iron pole pieces 15-16,

each of which ismade up of a plate A and.

.an arc-shaped piece B, preferably formed integral with each other,

17 indicates a shaft, preferably formed of non-magnetic material; adapted to be mounted in any suitable bearings (not shown) and adapted to' be driven in any appropriate manner.

18 indicates a plate, per'ferably formed of softfiron, fixedly secured on the shaft 17, with itsends formed in arcs of a circle about the shaft 17 and of a length to extend from one pole piece to the other with a very slight air gap intervening at each end.

A19 indicates a bar of non-magnetic material xedly secured on the shaft 17 bearing aov at its ends laminated soft-iron arc-shaped piecesl 20-21. These parts 20-21 are of substantially the same shape as the-parts B of the pole pieces 15--16, the four part-sv when in the position shown in the drawings giving the appea' ltnce of a complete ring, as shown in Fig. 2. As seen also in Figs. 1 and 3, the parts 20-21 are adapted to rotate opposite the parts ,B at a very short dist-ance therefrom, such distance'being as small as mechanical considerations will permit.

22-23 indicate arc-shaped laminated sott-iron pieces connected' to laminated softiron vbars 24-25, respectively, which are connect-ed Iat their opposite ends to a laminated soft-ironbar 26. These parts 22- 23-24-25'-26 constitute a corel upon which the primary coil 27 and the secondary coil 28 are mounted, said. coils 27 and 28 being illustrated conventionallyin Fig. 3. It will be understood that if so desired, t-he parts 22-28-24-25-26 may be made integral. The parts 22-23 alsoiare of sub stantially the same shape asthe parts b ot the pole pieces 1,5-16, and are located directly opposite such parts B at practically the same distance beyond the rotating parts 20-21 as that between the parts B and such rotating parts.

29 indicates a casing formed of non-magnetic material which incloses fmore or less completely'the coils and rotating parts.

With the rotating parts 20-21 in the position shown in Fig. 2, it will be understood that almost all of the magnetic lines of force will be passing from one pole piece to the other directly through the parts 20- V21 and the part 18, practically none'of them being diverted through the core about which the coils are wound, on account of the fact that, for a flow directly from pole topole through t-he parts 20-21 or the part 18, only two small air gapsmust be jumped, while, for a flow through the stationary core, two large air gaps would have to be jumped. When the rotating parts have been moved very slightly in advance, however, in the direction indicated by the arrow in Fig. 2, for example, the effectiveness ot the parts 20- 21 and the part 18 as a Yreturn path for the linesof magnetic `force directly from one pole piece to the otheris quite suddenly di-' minished and cut off. At the same time, the parts 20-21 are brought into position to bridge between'the pole .pieces and the parts 22.--23 ot' the core, the small air gaps intervening between'the'parts 20-2l and the pole pieces on one side and the parts 22- 23 on the other being so slnall as to afford very littlefresistance, a very effective magnetic circuit being thus completed through the laminated core and a ilow of the magnetic' lines of torce through said core being accordingly set up. As rotation proceeds,

the effectiveness of the parts 20--21 in bridging the large air gaps between the polepieces 15-16 and the arc-shaped pieces 22- 23 of the core gradually increases until the bar' 19 is at right angles to the position shown in Fig. 2 and the parts 20H21 are standing directly between;4 lthe pole pieces and the parts 22-23 of the core, the mag."

'number of lines of force pass through the core just before the parts 20-21 bridge directly between the pole pieces 15-16 inthe posi-tion shown in the figures, and therefore just immediatelylin advance of the sudden breaking of the lines ofvforce and their diversion -through the parts 20-#21- `andthe part 18 directly from pole to pole as above described. 'The reluctance o :E- the softsironcore to be dema etizedfdelays the abrupt change in magnetic conditions in the,

core until a slightly later moment, at which later time it will be understood the circ'uit of the primary coil is to be broken luy-any would be included ordinarily in a commer-v cial embodiment of my machine, but linasmuch as the distributer does not affect the operation of the magneto I have not shown or described it.

I have shown my magneto equipped with the bar 18 especially for the purpose, as described above', of taking away the vend' thrust from the aXle of the rotat-in parts at the time that the parts 20-21 begin their passage alongside ofthe pole pieces,l and this is the construction I prefer to use. In casethe part 18 is employed, the lines ot force travel directly from pole vto pole through both the parts 20-21 and 'the -part 18 when producing a sudden change in magnetic conditions in the stationary core as above described, but this same change in magnetic conditions in the core would result-either from the use of the bar 18 alone as a return path provided the parts 2021 were not made long enough to bridge between the pole pieces, for eXample,-or from the use of the parts 20-21 as shown with the. pari 18 omitted entirely. I therefore do not limit myseli"- to the use of the bar 18 or of the parts 20m2] ot such. length as to bridge directly between the pole pieces. ex. cept ashereinafter claimed. i

l have described'niy magneto as of the high-tension typebut it will be understood that I do not limitv myself to this construction and that only a single coil may be mounted on the stationary core if desired.

By my invention lprovide a construction by which the flux of magnetism through the core on which the coils are mounted does not change-in direction butV remains always in the same direction, varying only in intensity, such variation being practically from zero to the maximum at each half revolution of' the rotatingparts. Thisconstruction also .makes possible the winding and finishing olI the coil or coils independently of the core upon which they are to be mounted, being slidinto place in completed condition on one section of the core, the parts 'of the core being thereafter 'united with magnetically tight joints.-

By the term horseshoe magnet asus-ed in the claims, I mean a magnet having its poles 'arranged opposite each other atter the i fashion ot the ordinary horseshoe magnetbut do not wish to have any other restrictions upon the term, either as to its structure or its energization.

lVhat l claim as my invention and desire to secure by Letters Patent isl. In a magneto, the combination ot a magnet, a stationary sott-iron core magnetically separated therefrom bywide air gaps, a coil mounted on said stationary core, and a rotary device comprising a soft-ironpart adapted to be rotated between said magnet and said core and adapted during a portion ot the time only to e'lteetually bridge said air gaps, and comprising also a sott-iron part located directly between the. poles of said magnetA and adapted, during the time thatsaid first-mentioned soft-iron part is not serving to bridge between said magnet and said core, to completethe magnetic circuit directly `from pole to pole.

i2'. ln. a magneto, `the combination of a magnet, a` statibuary soft-iron core magnetically separated therefrom by wide air gaps, a coil mounted on said stationary core, and a rotary device comprising an axle journaled midway between ,the poles ot' said magnet, a soft-iron part mounted on said axlev and adapted to be rotated between the poles of said magnet and said core and adapted during a portion ot the time only to e'ttectually bridge said air gaps, and a sott-iron bar ixedly secured on said axle between thepoles ofsaid magnet and adapted to reach substantially from one pole to the other and adapted, during the timethat said trst-mentioned softiron part is not serving to bridge between said magnet and said core, to complete the magnetic circuit directly t'rom pole'to pole.

il. ln a magneto, the combination of' a magnet. sott-iron pole pieces therefor each wuuprising an are-shaped part located along` side of one pole ot' said magnet, a stationar sott-iron core magnetically separated there` from at its ends by Wide air gaps, said core comprising arc-shaped end pieces correspondlng to the shape of the arc-shaped parts of the pole pieces and located opposite the same, a coil mounted on said core, and a rotary device adapted to be rotated between said pole-pieces and said core and adapted during a portion ot' each rotation to etectually bridge said air gaps.

i. In a magneto, the combination of a magnet, soft-iron pole pieces'theretor each comprising an arc-shaped part located alongside of one pole of said magnet, a stationary soft-iron core magnetically separated therefrom at its ends by wide air gaps, said core comprising arc-shaped end pieces corresponding to the shape of the arc-shaped `parts of the pole pieces and located opposite lthe same, -a coil mounted on said core, and a rotary device comprising an axle, a bar of non-magnetic material tixedly secured thereon, and arc-shaped soft-iron parts corresponding in shape to that of the end pieces of said core and tixcdly secured on the ends of saidbar, the arc-shaped parts of said rotary device being adapted to eftectually bridge said air gaps during a portion of each rot-ation of said rotary device. i

5. In a magneto, the combination of a magnet, sott-iron pole pieces therefor each comprising an arc-shapedA part ylocated alongside of one of said magnet poles, a stationary soft-ironh core magnetically separated therefrom at its ends by wide air gaps, said core comprising laminated soft-,iron arcshaped end pieces corresponding in shape to that of the arc-shaped parts of the pole `pieces and located-opposite the same, and

laminated soft-iron bars connecting said end pieces, a coil mounted on said core, and a rotary device comprising an axle, a bar of non-magnetic material tixedly secured thereon, and laminated soft-iron arc-.shaped parts corresponding in shape to that o-t the end pieces of sadd core tixedly secured on the ends of said bar, each ot said arc-shaped parts of said rot-ary .device being adapted to afford a path for the magnetic lines of force directly from .,ne pole piece to the other of said magnet with only two small intervening air gaps atI two phases 'of its rotation and being adapted during the remaindeii of leach rotatiorfto afford a\path for the magnetic lines of force from said pole pieces to the ends of said coreonly, with four small intervening airgaps.

- 6. In a magneto, the combination of a' horseshoe magnet, a returnplate arranged opposite. the poles of said magnet, a rotary armature positioned opposite the poles of saidmagnet and adapted during a portion only ot' each rotation to complete the magnetic circuit. from one pole to' the other through said return late,- and a rotary armature positioned tirectly between the poles of said magnet and adapjti'ey to co1nsaid magnet and adapted during a portiononly of each rotation to -coinpletetlie magnetic circuit from one pole to the other Vthrough said return plate, and a rotary armature positioned directly between the poles of said magnet and adapted to complete the in each I(instance before said irst-mentioned arinatu Ve through said return plate.

8, In a magneto, the combination of a horseshoe magnet, a return. plate arranffed' fopposite the poles Vof said magnet, a rotry I armature positioned opposite the poles of said magnetand adapted during a portion only of each rotation to .complete the magnetic circuit from onel pole tothe other through said return plate, and a rotary ar- .mature positioned directly between the poles oi" said magnet land adapted to complete the magnetic circuit directly from pole to pole Iin each instance before said first-mentioned armature passes out of the return path `ithrough said return plate and adapted to [continue to so serve until the lirst-mentioned l Qarmature magnetic circuit directly from ypoleto pole,V

passes out of the' return path again completes the circuit through said return plate.

ROBERT C. LANPHIER. Witnesses:-

CHARLES E. PICKARD, W. H. DE BUsK. 

